Example #1
0
//glut display function
void display(void)
{
	
	glClear(GL_COLOR_BUFFER_BIT);
	
	// Draw all the points
	glColor3f(1.0, 0.0, 0.0);  
	for (int x=0; x<numPoints; x++)
		polyPoint[x].draw();

	// Draw the polgon
	if (initializeComplete)
	{
		glColor3f(0.0, 0.0, 1.0);
		glBegin(GL_LINE_LOOP);
	for (int x=0; x<numPoints; x++)
			glVertex2f(polyPoint[x].getX(), polyPoint[x].getY());
		glEnd();
	}
	
	// Draw the test point, and the text saying whether it's inside or outside.
	if (firstPointDrawn)
	{
		char inside[] = "The point drawn is INSIDE the polygon.";
		char outside[] = "The point drawn is OUTSIDE the polygon.";

		glColor3f(0.0, 1.0, 0.0);  
		testPoint.draw();

		char* dispText = (pointInside) ? inside : outside;

		glRasterPos2i(100,100);
		for (int x=0; x< strlen(dispText); x++)
			glutBitmapCharacter(GLUT_BITMAP_8_BY_13, dispText[x]);

	}
	glutSwapBuffers();